What was the main objective of the discovery missions? (topic: space exploration)

a.

to enhance our understanding of the solar system

b.

to discover extraterrestrial life outside the solar system

c.

to test new rockets developed by nasa

d.

to discover and capture an asteroid

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?